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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109213] [13 Regression] -Os generates
 significantly more code since r13-723
Date: Tue, 21 Mar 2023 13:37:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109213

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu.org

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
t.c:26:5: missed:   not inlinable: main/7 -> m/6, --param
large-stack-frame-growth limit reached

and after the DSE:

IPA function summary for main/7 inlinable
  global time:     38.636364
  self size:       11
  global size:     11
  min size:       8
  self stack:      0
  global stack:    0

IPA function summary for m/6 inlinable
  global time:     86.705545
  self size:       22
  global size:     22
  min size:       19
  self stack:      264
  global stack:    264

vs.

IPA function summary for main/7 inlinable
  global time:     42.636364
  self size:       14
  global size:     14
  min size:       11
  self stack:      40
  global stack:    40

without the DSE.  And we apply the limit in a quite complicated way
in caller_growth_limits, changing mains stack size to 1 or 4 doesn't
help, so it isn't a totally arbitrary special-casing of zero caller stack
size.

I'm leaning towards a WONTFIX or reclassify as non-regression.  The bug
is definitely not that we now do more DSE, the pre-existing bug might be
that we take the absolute size of the caller stack into account.=